#include "drv_adc.h"
uint16_t buf[100]={0};
void drv_adc_init(void)//PB1
{	
	GPIO_InitTypeDef  GPIO_InitStruct;
	ADC_CommonInitTypeDef  ADC_CommonInitStruct;
	ADC_InitTypeDef  ADC_InitStruct;
	DMA_InitTypeDef DMA_InitStruct;

	RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_GPIOB|RCC_AHB1Periph_DMA2,  ENABLE);
	RCC_APB2PeriphClockCmd( RCC_APB2Periph_ADC1,  ENABLE);
	
	GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AN;
	GPIO_InitStruct.GPIO_Pin=GPIO_Pin_1;
	GPIO_InitStruct.GPIO_PuPd=GPIO_PuPd_NOPULL;
	
	GPIO_Init(  GPIOB, &GPIO_InitStruct);

	ADC_CommonInitStruct.ADC_DMAAccessMode=ADC_DMAAccessMode_Disabled;
	ADC_CommonInitStruct.ADC_Mode=ADC_Mode_Independent;
	ADC_CommonInitStruct.ADC_Prescaler=ADC_Prescaler_Div4;
	ADC_CommonInitStruct.ADC_TwoSamplingDelay=ADC_TwoSamplingDelay_5Cycles;
	
	ADC_CommonInit(& ADC_CommonInitStruct);

	ADC_InitStruct.ADC_ContinuousConvMode=ENABLE;
	ADC_InitStruct.ADC_DataAlign=ADC_DataAlign_Right;
	ADC_InitStruct.ADC_ExternalTrigConvEdge=ADC_ExternalTrigConvEdge_None;
	ADC_InitStruct.ADC_NbrOfConversion=1;
	ADC_InitStruct.ADC_Resolution=ADC_Resolution_12b;
	ADC_InitStruct.ADC_ScanConvMode=DISABLE;
	ADC_Init(ADC1, & ADC_InitStruct);

	DMA_InitStruct.DMA_BufferSize=100;
	DMA_InitStruct.DMA_Channel=DMA_Channel_0;
	DMA_InitStruct.DMA_DIR=DMA_DIR_PeripheralToMemory;
	DMA_InitStruct.DMA_FIFOMode=DMA_FIFOMode_Disable;
	DMA_InitStruct.DMA_Memory0BaseAddr=(uint32_t)buf;
	DMA_InitStruct.DMA_MemoryBurst=DMA_MemoryBurst_Single;
	DMA_InitStruct.DMA_MemoryDataSize=DMA_MemoryDataSize_HalfWord;
	DMA_InitStruct.DMA_MemoryInc=DMA_MemoryInc_Enable;
	DMA_InitStruct.DMA_Mode=DMA_Mode_Circular;
	
	DMA_InitStruct.DMA_PeripheralBaseAddr=(uint32_t)&ADC1->DR;
	DMA_InitStruct.DMA_PeripheralBurst=DMA_PeripheralBurst_Single;
	DMA_InitStruct.DMA_PeripheralDataSize=DMA_PeripheralDataSize_HalfWord;
	DMA_InitStruct.DMA_PeripheralInc=DMA_PeripheralInc_Disable;
	DMA_InitStruct.DMA_Priority=DMA_Priority_High;
	
	DMA_Init(DMA2_Stream0,&DMA_InitStruct);

	ADC_RegularChannelConfig( ADC1,  ADC_Channel_9, 1,  ADC_SampleTime_84Cycles);
	ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
	ADC_DMACmd(ADC1,ENABLE);//使能ADC dma
	ADC_Cmd( ADC1,  ENABLE);
	DMA_Cmd(DMA2_Stream0,ENABLE);
	ADC_SoftwareStartConv(ADC1);

}
uint16_t drv_adc1_value(void)
{
	uint8_t i=0;
	uint32_t sum=0;
	for(i=0;i<100;i++)
	{
		sum+= buf[i];
	}
	return (uint16_t)(sum/100);
}
